Interest of a liner for a dam

Installing a Dam Liner

1. Common Materials Used

High-Density Polyethylene (HDPE) is the most common liner material due to its durability, UV-resistance, and long lifespan. Other options include PVC (more affordable but less durable), LLDPE, EPDM, and butyl rubber—though HDPE remains the most popular choice.

2. Material Thickness & Lifespan

Thickness options typically range from 0.3 mm to 1.0 mm, with each thickness suited for specific surface conditions and longevity expectations:

0.3 mm – suitable for smooth surfaces, lasts 5–10 years

0.5 mm – fits mildly rough surfaces, lasts 10–15 years

0.75 mm – ideal for rocky or irregular terrain, lasts 15–20 years

1.0 mm – best for large or harsh terrain, lasted up to 30 years

3. Cost Estimates per Square Meter

Prices vary by supplier and thickness:

4. Installation Process

Surface Preparation: Clear sharp debris or uneven ground to avoid punctures.

Measuring & Cutting: Cut liners as needed and overlap adjoining pieces by ~15 cm, then weld or heat-fuse them together.

Anchoring:

Trenching method: Dig an anchor trench around the edges (e.g. ~0.75 m deep), tuck the liner in, and backfill with soil or stones.

Sandbags: Place sandbags or heavy objects on the edges to hold the liner in place.

Installation Tools: Welding (hot wedge or blower) is commonly used for on-site joins. Preferably, liners come factory-welded to reduce leak risk.

Post-installation: Inspect regularly for punctures or damage, clean off debris, and repair as needed.

5. Benefits of Using Liners

Dramatically reduces water loss through seepage—conserving up to 90% of water in reservoirs.

Enhances water availability, supports agricultural expansion (some users reported a ~40% increase in water storage capacity).

Protects dam structure from erosion, prolongs lifespan, and is safe for aquaculture and drinking water when correctly installed.